Product barcode required

This module adds a company setting that makes the product barcode a required field. You turn it on in Settings, in the new "Products barcode" section, with the option "Make barcode required". The setting is stored per company and is only visible to users who can manage product variants.

Once enabled, Odoo checks products when they are created or modified. If a product is not a service and has no barcode, saving is blocked with an error listing the products that have no barcode. Products with several variants are excluded from this rule, and the barcode field is hidden on the template form when the product has more than one variant.

On the product forms (both the normal product form and the simplified variant edit form), the barcode field becomes mandatory when the rule applies. When you type an internal reference (default_code) on a product that still needs a barcode, Odoo automatically copies that reference into the barcode field.

The module touches product.template, product.product, res.company and res.config.settings. It also provides a reusable mixin, product.barcode.required.mixin, so other modules can apply the same barcode check in their own constraints.